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Django-graphos is a tool to create Graphs. (doh). There are two things which Graphos gives you over a low level graph manupulation.
It provides various data sources.
It provides various renderers.
Graphos makes it very easy to switch between different data source and renderers.
Are you building your charts with Flot but would like to later switch to Gchart? In many cases, it might be as easy as switching an import statement.